Tayari Plaza

As I said, you should use your silenced pistol to pick off grunts for a easier ending.(Heroic Guide)
If you want to play easy or normal you would hav no problem just charging down and killing everyone. After taking down the brutes you take a carbine and a plasma pistol. Remember where u left your pistol, you might need it after your carbine runs out. Go through and try not to let the two marines die. Use a over charged plasma bolt to take down shields and pump a bullet of carbine in the brutes face.(Overcharge-headshot combo) keep doing it till u have 1 ammo. Switch Carbine with Marine and take assult rifle. Overcharge plasma pistol the turret grunt. Throw grenades into the group at the back, recharge stamina. The rest is easy, use assulat rifle before taking back a carbine. Jackals problem at next area. Use Carbine to take down sniper jackal (IMPORTANT!In heroic the jackal sniper can kill u in a headshot or 2 bullets). Use grenades to kill those around mid-dist. Use overcharge-Melee combo those near u and take cover. Then move with marines to kill the remains.(Stay alert for kamakazi grunts).Next part is hunters... Get a shotgun and a carbine, 90% of ur marines will di. Spam carbine and finish everyone till u have no ammo. Try to conserve, but use all. Take a assult rifle, Kill all remaining enemies near u. Use Plasma-Shotgun combo on gold hunter, try not u to let the hunter shoot u, but go in near range. Keep strafing so they will keep missing. Shoot their backs if possible or just us Plasma-shotgun combo. Spam grenades on the rest waste all ammunution to make it easier. Get any gun. Kill those 3 grunts and complete level...